Characterization of Shear and Compaction Bands in Sandstone Using X-ray Tomography and 3D Digital Image Correlation

E-M. Charalampidou3 — S.A. Hall2 — S. Stanchits3 — G. Viggiani2 — H. Lewis1

1 Institute of Petroleum Engineering, Heriot-Watt UniversityEdinburgh EH14 4AS, Scotlandelma.charalampidou@pet.hw.ac.ukhelen.lewis@pet.hw.ac.uk

 

2 Laboratoire 3S-R- CNRS/Université Joseph Fourier/Grenoble INPDomaine Universitaire, BP53, 38041 Grenoble, Francehall@geo.hmg.inpg.frcino.viggiani@hmg.inpg.fr

 

3 Deutsches GeoForschungsZentrum GFZTelegrafenberg, D 423, D-14473 Potsdam, Germanystanch@gfz-potsdam.de

ABSTRACT. In this work we employ x-ray tomography, 3D digital image analysis and 3D-volumetric digital image correlation techniques to characterize localized deformation phenomena in sandstone. The specimens considered have been deformed in triaxial compression under a range of confining pressures (20-190MPa). Shear or compaction bands were observed, at low and higher confinement respectively. X-ray tomography images have been acquired before and after loading (unconfined) at different spatial resolutions (30 and 90 µm voxel size). The combination of both x-ray tomography and 3D DIC provides insights into the geometry and mechanisms of the localized features.

 

KEYWORDS: sandstone, localization, shear bands, compaction bands, x-ray tomography, 3D digital image correlation

1. Introduction

Porous sandstones generally exhibit strain localization when loaded in triaxial compression. The ...

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